Overall complication rates
| Outcome | No. of Studies | Raw No. of Events in All Aneurysmsa | Meta-Analysis Percentage (95% CI) | I2 |
|---|---|---|---|---|
| Intraoperative rupture | 11 | 57/1387 | 4% (3–6%) | 0 |
| Vasospasm | 6 | 182/1091 | 13% (5–28%) | 95 |
| Re-bleeding event | 11 | 16/1065 | 2% (1–4%) | 0 |
| Aneurysm retreatment | 10 | 73/777 | 7% (5–12%) | 60 |
| Morbidity or mortality due to stroke <30 days | 10 | 21/771 | 3% (2–6%) | 32 |
| Permanent procedure-related morbidity | 11 | 53/1077 | 6% (4–8%) | 47 |
| Procedure-related mortality | 11 | 25/1077 | 3% (2–4%) | 15 |
↵a Discordances between the raw event percentages and the percentages calculated from the meta-analysis are caused by greater weights assigned to outcomes of studies with larger sample sizes.